French screen icons Emmanuelle Riva and Jean-Louis Trintignant dish on life, performing and working with director Michael Haneke in 'Amour.'

PARIS — Up four old, crooked flights of stairs in her apartment building with no elevator, Emmanuelle Riva sits wrapped in a thick, woven, poncho-like sweater. Warm light streams through colorful windowpanes into her narrow living room, where Riva lives alone, and she's just turned off a pot of boiling water for tea.

More than half a century ago, she exploded onto the screen with her mesmerizing interpretation of a modern beauty haunted by love and war in the classic "Hiroshima Mon Amour." And at age 85, "I'm still a great savage," she announces.

Meaning? "I don't obey every demand. A savage is someone who goes off into the woods and does what she wants," says the actress who stars with another giant of the French screen, 81-year-old Jean-Louis Trintignant, in Michael Haneke's critically acclaimed French-language drama "Amour" (Love), opening in U.S. theaters Dec. 19.

After all, "retirement is not a word!" belts out Riva, her back stiffening, after confirming she still high-tails it to the forest when it suits her. "If I remember correctly, I was, how do you call it? Subversive," she adds, with a lighthearted laugh that breaks through more serious tangents about fleeting existence, the spinning universe and our fast-paced lives within it. "I've calmed down a little — well, sort of."

Less a form of entertainment than an engulfing experience, "Amour," which won the Cannes Film Festival's Palme d'Or for best picture this year, is both a heartwarming and tragic look at an elderly couple's love as they intimately struggle with the strange business of aging, and the body as it unsparingly falls apart. Both French actors, whose moving performances have been praised as much as the vision of the film's director, make it clear that "Amour" is a milestone in their long careers, practically a blessing.

Riva plays an elderly, cultivated pianist whose body suddenly goes into paralysis, repeatedly freezing for a few minutes. After treatment, she is left partially paralyzed. Her mind also slowly takes its leave, as her husband and fellow musical connoisseur, played by Trintignant, cares for her alone.

Both actors are deeply grateful for the late-career opportunity to work with Haneke, and they discuss their ideas about performance with a mixture of depth and whimsy.

"At 84, what happened to me with 'Amour' was un-hoped for," says Riva, a published poet who has appeared in some 40 films, including Georges Franju's "Thérèse Desqueyroux" and Krzysztof Kieslowski's "Blue." "I was ready for it!" Pausing between each word, she adds in French: "I. Was. Completely. Ripe... Like when I got the role for 'Hiroshima.' I was also absolutely, down to the minute, READY."

However, it took some prodding for Trintignant to accept the role. Although he had acted in some 130 films, it had been 16 years since he had worked on a movie, except for one small role, says the star of Bernardo Bertolucci's "The Conformist," Eric Rohmer's "My Night at Maud's" and Claude Lelouch's "A Man and a Woman."

"I think our real trade is in theater. We do movies a little out of vanity and cupidity ... that's why I do them," Trintignant says with a half-smile on another day, resting on his cane in the lobby of a Montmartre hotel. He became one of France's dashing young celebrities in the 1950s when he dated Brigitte Bardot, and he played opposite her and other French beauties: Catherine Deneuve, Anouk Aimée, Romy Schneider.

He is adored in France today for his self-deprecating wit and endearing confessions to various weaknesses; whether they be his long struggle with shyness, which he says acting helped alleviate, or succumbing too easily to women. In addition to his preference for theater, his hesitation to work on this particular film was influenced by the loss of his daughter, who died of injuries after her lover beat her in 2003.

"I've never gotten over it; it didn't happen long ago, the most important dramatic event of my life," he says later in a telephone interview. That's why working on the film "frightened" him, he says, and was difficult. Before filming began, he told "Amour" producer Margaret Ménégoz that he wanted to commit suicide.

Instead of taking that as a no, Trintignant says, Ménégoz told him, "'I understand perfectly well that you want to commit suicide, but do this film first. Kill yourself after. I'll even help you kill yourself.'" After the filming, she promptly asked: "OK, how do we go about it?" the actor recalls. "I said, 'Well [he laughs], let's wait a little.'